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    Patient with oxygen mask in an operating room — Stock Photo
    Patient with oxygen mask in an operating room
    Side view of mature mixed-race female patient sleeping in bed in the ward at hospital — Stock Photo
    Side view of mature mixed-race female patient sleeping in bed in the ward at hospital
    Measuring oxygen levels in blood with pulse oximeter. — Stock Photo
    Measuring oxygen levels in blood with pulse oximeter.
    Doctor putting on woman resuscitation mask. — Stock Photo
    Doctor putting on woman resuscitation mask.
    Scuba diver underwater under sun beams — Stock Photo
    Scuba diver underwater under sun beams
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Cardiovascular system transporting nutrients and oxygen — Stock Photo
    Cardiovascular system transporting nutrients and oxygen
    Anesthesiologist holding oxygen mask over patient's face in operating theater — Stock Photo
    Anesthesiologist holding oxygen mask over patient's face in operating theater
    Little kid using inhaler in clinic during check up — Stock Photo
    Little kid using inhaler in clinic during check up
    Close-up of plugs in wall in animal hospital — Stock Photo
    Close-up of plugs in wall in animal hospital
    Mount Nuptse Everest Himalaya Nepal — Stock Photo
    Mount Nuptse Everest Himalaya Nepal
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    Doctor putting oxygen mask on patient in hospital — Stock Photo
    Doctor putting oxygen mask on patient in hospital
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Crop unrecognizable woman using modern pulse oximeter on finger of kid for measuring oxygen level in blood — Stock Photo
    Crop unrecognizable woman using modern pulse oximeter on finger of kid for measuring oxygen level in blood
    Doctor, nurse and paramedics examining patient on stretcher — Stock Photo
    Doctor, nurse and paramedics examining patient on stretcher
    Astrocyte glial nerve cell, digital illustration. — Stock Photo
    Astrocyte glial nerve cell, digital illustration.
    Cardiovascular system transporting nutrients and oxygen — Stock Photo
    Cardiovascular system transporting nutrients and oxygen
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Scenic view of scuba divers swimming under water with fishes — Stock Photo
    Scenic view of scuba divers swimming under water with fishes
    Anesthesiologist holding oxygen mask over patient during surgery — Stock Photo
    Anesthesiologist holding oxygen mask over patient during surgery
    Pilot in mask operating airplane during flight — Stock Photo
    Pilot in mask operating airplane during flight
    Doctor with oximeter examining little patient — Stock Photo
    Doctor with oximeter examining little patient
    Male patient with nasal cannula, portrait. — Stock Photo
    Male patient with nasal cannula, portrait.
    Doctor holding oxygen mask over patient's face in intensive care unit — Stock Photo
    Doctor holding oxygen mask over patient's face in intensive care unit
    Close up of rapids in a mountain river with long exposure effect — Stock Photo
    Close up of rapids in a mountain river with long exposure effect
    Hand of a doctor giving oxygen to a pregnant woman in operating room — Stock Photo
    Hand of a doctor giving oxygen to a pregnant woman in operating room
    Front view of surgeons concentrated performing operation in operating room at hospital against spots and digital screen in background — Stock Photo
    Front view of surgeons concentrated performing operation in operating room at hospital against spots and digital screen in background
    Leaf epidermis, light micrograph. Leaf epidermis has small pores, called stomata, which open up for photosynthetic gas exchange and transpiration. — Stock Photo
    Leaf epidermis, light micrograph. Leaf epidermis has small pores, called stomata, which open up for photosynthetic gas exchange and transpiration.
    Team of doctors putting oxygen mask on a male senior patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on a male senior patient face in the hospital
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Anesthesiologist holding oxygen mask over patients face in operating room — Stock Photo
    Anesthesiologist holding oxygen mask over patients face in operating room
    Anesthesiologist holding oxygen mask over patient?s face in operating room — Stock Photo
    Anesthesiologist holding oxygen mask over patient?s face in operating room
    Surgeons performing operation in operation theater of hospital — Stock Photo
    Surgeons performing operation in operation theater of hospital
    Close-up of senior patient wearing oxygen mask lying on hospital bed — Stock Photo
    Close-up of senior patient wearing oxygen mask lying on hospital bed
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Paramedics examining patient in ambulance — Stock Photo
    Paramedics examining patient in ambulance
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras — Stock Photo
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras
    Surgeon holding oxygen mask in operation room at hospital — Stock Photo
    Surgeon holding oxygen mask in operation room at hospital
    Surgeon holding oxygen mask in operation room at hospital — Stock Photo
    Surgeon holding oxygen mask in operation room at hospital
    Astrocyte glial nerve cell, digital illustration. — Stock Photo
    Astrocyte glial nerve cell, digital illustration.
    Overview of diverse doctors interacting with patients in the ward at hospital — Stock Photo
    Overview of diverse doctors interacting with patients in the ward at hospital
    Attentive male scientist working in laboratory — Stock Photo
    Attentive male scientist working in laboratory
    Senior woman sleeping with nasal cannula and IV bag, close-up. — Stock Photo
    Senior woman sleeping with nasal cannula and IV bag, close-up.
    Landscape in the Simien Mountains National Park. View from peak Imet Gogo over the highlands, the escarpment and the lowlands of the National Park with the endemic Giant Lobelia Lobelia rhynchopetalum. Imet Gogo is the best known viewpoint in the Pa — Stock Photo
    Landscape in the Simien Mountains National Park. View from peak Imet Gogo over the highlands, the escarpment and the lowlands of the National Park with the endemic Giant Lobelia Lobelia rhynchopetalum. Imet Gogo is the best known viewpoint in the Pa
    Doctors examining senior patient with stethoscope in hospital bed — Stock Photo
    Doctors examining senior patient with stethoscope in hospital bed
    Doctor practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctor practicing bag-valve-mask ventilation on training dummy.
    Pine forest landscape with long shadows cast by the sun in woods — Stock Photo
    Pine forest landscape with long shadows cast by the sun in woods
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet — Stock Photo
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet
    Side view unrecognizable person in silver costume with breathing apparatus and hose attached to potted plant sitting on chair in weathered abandoned house room — Stock Photo
    Side view unrecognizable person in silver costume with breathing apparatus and hose attached to potted plant sitting on chair in weathered abandoned house room
    3d illustration of red blood cells erythrocytes, white blood cells leukocytes and platelets thrombocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes, white blood cells leukocytes and platelets thrombocytes.
    Scuba diver swimming under water with cute turtle — Stock Photo
    Scuba diver swimming under water with cute turtle
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Side view of Caucasian male patient sleeping with his hand on chest in bed in the ward at hospital — Stock Photo
    Side view of Caucasian male patient sleeping with his hand on chest in bed in the ward at hospital
    Side view of Caucasian male patient sleeping on bed in the ward at hospital. In the background diverse doctors discussing x-ray with mixed-race male patient. — Stock Photo
    Side view of Caucasian male patient sleeping on bed in the ward at hospital. In the background diverse doctors discussing x-ray with mixed-race male patient.
    Close-up of senior patient wearing oxygen mask lying on hospital bed — Stock Photo
    Close-up of senior patient wearing oxygen mask lying on hospital bed
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    Crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic while using laptop — Stock Photo
    Crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic while using laptop
    Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body — Stock Photo
    Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body